Fixing device

A fixing device for fixing a toner image formed on a recording medium to the recording medium, the fixing device comprising:

• a film unit including a tubular film that is configured to rotate while being in contact with the recording medium;
• a roller configured to be in contact with an outer surface of the tubular film, wherein the roller and the film unit form a fixing nip portion configured to pinch and convey the recording medium on which the toner image is formed;
• and
• a frame that includes a first side frame configured to hold one end portion of the film unit in a longitudinal direction of the fixing device and includes a second side frame configured to hold the other end portion of the film unit in the longitudinal direction,
• wherein at least one of the first side frame and the second side frame includes a first plate configured to hold at least one of the film unit and the roller, and a second plate disposed substantially parallel to the first plate and having a surface facing the film unit, and
• wherein the first plate is fixed to the second plate and is disposed on a side of the surface of the second plate orthogonal to the longitudinal direction.